Several years ago, I had a slight bloody discharge from the left breast. After two weeks, I had a ductogram performed, which was inconclusive. I underwent an excisional biopsy which came back ductal carcinoma in situ. I was fortunate that this had given me a signal that something might have been wrong. I underwent radiation, and have been fine since then. If it persists, I would see a breast specialist to rule out DCIS.